Attention and concentration problems can be because of Depression, Anxiety or Obsessive Compulsive Disorder or ADHD. Stimulants are required only in case of ADHD. There is hesistation amongst Medical practitioners in prescribing stimulants as they are Schedule X Drugs and carry abuse potential. I personally think that whenever required in best interest, stimulants should be used.
Diagnosis of ADHD in adults requires information from person who has knowledge about your behaviour in childhood (usually parents)
Next Steps
Meet a Psychiatrist along with your parents and discuss all these issues.
Health Tips
Avoid self medication